94 lines
3 KiB
C
94 lines
3 KiB
C
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/*
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* Copyright (C) 2020 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <elf.h>
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#include <link.h>
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#include "linker_soinfo.h"
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// The Elf* structures below are derived from the document
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// Linux Extensions to gABI (https://github.com/hjl-tools/linux-abi/wiki).
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// Essentially, these types would be defined in <elf.h>, but this is not
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// the case at the moment.
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struct Elf32_Prop {
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Elf32_Word pr_type;
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Elf32_Word pr_datasz;
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char pr_data[0];
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};
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// On 32-bit machines this should be 4-byte aligned.
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struct Elf32_NhdrGNUProperty {
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Elf32_Nhdr nhdr;
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char n_name[4];
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char n_desc[0];
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};
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struct Elf64_Prop {
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Elf64_Word pr_type;
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Elf64_Word pr_datasz;
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char pr_data[0];
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};
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// On 64-bit machines this should be 8-byte aligned.
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struct Elf64_NhdrGNUProperty {
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Elf64_Nhdr nhdr;
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char n_name[4];
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char n_desc[0];
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};
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struct ElfProgramProperty {
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#if defined(__aarch64__)
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bool bti_compatible = false;
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#endif
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};
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// Representation of the .note.gnu.property section found in the segment
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// with p_type = PT_GNU_PROPERTY.
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class GnuPropertySection {
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public:
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GnuPropertySection(){};
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explicit GnuPropertySection(const soinfo* si);
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GnuPropertySection(const ElfW(Phdr)* phdr, size_t phdr_count, const ElfW(Addr) load_bias,
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const char* name);
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#if defined(__aarch64__)
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bool IsBTICompatible() const;
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#endif
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private:
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const ElfW(NhdrGNUProperty)* FindSegment(const ElfW(Phdr)* phdr, size_t phdr_count,
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const ElfW(Addr) load_bias, const char* name) const;
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bool SanityCheck(const ElfW(NhdrGNUProperty)* note_nhdr, const char* name) const;
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bool Parse(const ElfW(NhdrGNUProperty)* note_nhdr, const char* name);
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ElfProgramProperty properties_ __unused;
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};
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